Arming a module using the 18R2 will take approximately half a second to two seconds per device. Anything longer than this may indicate weak signal strength and should be investigated. Once armed, the ARM LED should remain solid. If the ARM LED begins blinking after going solid, this indicates you may have a module with a weak signal. If this occurs, we recommend placing your 18R2 in TEST mode to check your signal values. For assistance in checking signal strength, please see the 18R2 controller User Guide Signal Strength support document.